Ergonomic bookpack

ABSTRACT

An ergonomic bookpack having an automatic suspension system is disclosed. A series of top straps, side straps, bottom straps and optional support members serve to move the bookpack center of gravity higher in the bookpack and closer to the wearer&#39;s body, significantly redistributing the load borne by the wearer&#39;s shoulders along a longer portion of the body and back. The body of the bookpack can be made so that the interior compartment of the bookpack body is transparent and the contents of the bookpack are visible to the human eye. The invention also comprises an optional yoke and lumbar pad. This bookpack of allows the wearer to bear heavier loads for a longer period of time with less fatigue, thus reducing the possibility of debilitating musculoskeletal difficulties.

RELATED PATENT APPLICATION

[0001] This application is a continuation of U.S. patent applicationSer. No. 09/357,522, filed Jul. 19, 1999, the entirety of each is herebyincorporated by reference.

TECHNICAL FIELD

[0002] This invention is related to backpacks for day use. Inparticular, this invention is an ergonomically designed backpack inwhich the stresses presented to the wearer are minimized, allowing thewearer to carry heavier loads for a longer period of time with the leastpossible fatigue or discomfort.

BACKGROUND

[0003] The popularity of backpacks for day use has increasedsubstantially in recent years. Not only are they widely used for dayhiking, bicycling, and climbing, but these day packs are most prevalentamong students for carrying books and supplies between their homes andschool.

[0004] As national emphasis continues to be placed on improving schoolsand the quality of education afforded young people, many educationalinstitutions are extending the length of the school day. Students areaccordingly expected to be prepared for these longer days by carryingmore books and supplies than they have in the past. Moreover, manyschool districts are extending the length of the school year; thus,students are not only carrying heavier loads but are doing so withincreasing regularity.

[0005] Along with the heavier loads being carried more frequently bythese frameless packs comes the increased potential for fatigue,discomfort, poor posture, and even musculoskeletal disorder and injury.This places a premium on backpack design to minimize such potential.However, the suspension systems in many such backpacks are simplyincapable of providing an ergonomically correct fit.

[0006] What is needed is a day pack with a suspension system designed tomaximizing wearer comfort and health, even when the pack is fullyloaded.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007]FIG. 1 is a side view of a conventional bookpack shown as worn.

[0008]FIG. 2 is a simplified perspective view of the bookpack of thepresent invention detailing the bookpack body without the features ofthe automatic suspension system.

[0009]FIG. 3 is a perspective view of the bookpack of the presentinvention detailing the features of the automatic suspension system.

[0010]FIG. 3A is an alternative configuration for a bottom strap.

[0011]FIG. 4 is a bottom view of the bookpack of the present invention.

[0012]FIG. 4A is a perspective view of the bottom portion of thebookpack of the present invention.

[0013]FIG. 5 is a top view of the bookpack of the present invention.

[0014]FIG. 6 is a body side elevation of the bookpack of the presentinvention.

[0015]FIG. 6A is a simplified perspective view of the bookpack of thepresent invention with a lumbar pad.

[0016]FIG. 7 is an outer side elevation of the bookpack of the presentinvention.

[0017]FIG. 8 is a perspective view of a transparent body version of thebookpack of the present invention.

[0018]FIG. 9 is a side elevation of the bookpack of the presentinvention when worn.

DESCRIPTION OF THE INVENTION

[0019] Turning now to the figures, where like references refer to likeelements, a model wearing a conventional bookpack is shown in FIG. 1 inside view. For purposes of illustration, pack body 100 is assumed to bemoderately loaded with cargo, such as books, school supplies, and thelike.

[0020] Backpack body 100 is connected to a pair of shoulder straps 110,each of which is affixed to body 100. In FIG. 1, one such strap 110 isshown attached to body 100 at point 102.

[0021] The bookpack's center of gravity (CG), illustratively located inFIG. 1 at a position marked by reference numeral 104, tends to be farbehind the wearer's back and low in the backpack body. Such a positionis manifested by the sagging appearance of the backpack body 100.

[0022] The moment produced by the weight of the bookpack 100 with thissupport configuration is in a direction such that a force is producedtoward the body at position 106 and a force away from the wearer's bodyat point 102.

[0023] This configuration creates the large limited load distributiondepicted in FIG. 1 over a relatively small portion of the wearer's bodywhere the shoulder strap 110 meets the wearer's shoulder. It also causespoint 106 to act as a sort of hinge or pivot point, causing the backpackbody 100 to impinge on the wearer's back as shown near point 106. Nearlyall of the forces and moments caused by the bookpack weight are reactedat point 102, through the top portion of strap 110. As illustrated inFIG. 1, these forces pull the pack 100 out at the top and away from thewearer's body causing the shoulders to be pulled back. The weight isdistributed across a disproportionately small section of the shoulderstraps directly on top of the wearer's shoulders. It also forces theshoulder straps under the arm to ride up and pinch under the wearer'sarms.

[0024] Anyone who has seen a student walking across campus with a fullbookpack, hunched over and with their thumbs holding the shoulder strapsout off their chests has witnessed this effect. Such a configurationcauses unnecessary fatigue, discomfort, and the possibility of long-termmusculoskeletal difficulties.

[0025] In contrast, the bookpack of the present invention remedies theproblems caused by typical bookpacks such as that shown in FIG. 1. Oneembodiment of the present invention is shown in FIGS. 2-7 and 9.

[0026] A simplified backpack body 200 of the present invention is formedby a number of panels or sides as shown in FIG. 2 without a number ofthe inventive features so that the underlying components and numberingconventions can be first described.

[0027] Bookpack body 200 has a top side or region 202, a bottom side orregion 204, two lateral sides or regions 206, an outer side or region208, and a body side or region 210. When connected, these six panelregions define an interior compartment in body 200 into which cargo suchas books, food, clothing, etc. may be stowed. Of course, this region maybe subdivided into or complemented with a number of additionalcompartments or regions for keeping various items separate (facilitatingorganization, ease of ready access to frequently used items such as keysor water bottles, and allowing for the proper weight distribution andcomfort to the wearer).

[0028] The particular six-panel configuration herein described servestwo primary purposes. First, it provides a convention by which thefeatures of the invention can be described and the relationships amongthe various components can be shown. Second, it is a simple and graphicway to depict the general shape of bookpack body 200 when loaded withcargo, and corresponds to the principal views any generic cubic orrectangular three-dimensional body presents to an observer (top, bottom,and four sides).

[0029] Although six particular sides or panels are described, bookpackbody 200 can comprise fewer panels or sides, and have correspondinglyfewer seams or junctures, and be within the scope of the invention. Forinstance, in an extreme example, a configuration in which each of thebody, top, bottom, outer, and lateral sides are comprised of onecontinuous piece of fabric with no actual seams or junctures is withinthe scope of the present invention. In such a case, one may stilldescribe the body 200 as having a number of seams or junctures simply toaid the reader in understanding the relative location on the body 200being discussed. On the other hand, and at the other end of thespectrum, a configuration in which as many as ten or more panels orsides and corresponding seams or junctures is contemplated as well.

[0030] Separating the various panels or side regions described above area series of junctures or seams. For instance, a first juncture 212 isdefined between top panel 202 and body side 210. Second seams orjunctures 214 are similarly disposed along lines or region between theouter side 208 and the two lateral sides, 208. A third juncture or seam216 defines a transition region between the bottom panel 204 and theouter side 208, and a fourth juncture or seam 218 is disposed generallybetween the outer side 208 and the top panel or side 202.

[0031] These various seams or junctures are described herein strictly toassist the reader in understanding the construction of the variousembodiments of the invention and the locations of various attachmentpoints for components thereof.

[0032] In addition, the description of the various junctures is meant todefine a region as opposed to a specific location on body 200.Therefore, when for example a first juncture 212 between top side 202and body side 210 is described, it is expressly meant only to define ageneral region of transition between these two sides 202 and 210. Thismeans that one may move as many as several inches away from the firstjuncture 212 into the region of the top side 202 or body side 210, oranywhere along the line shown in the figures as defining thesejunctures, and still be within the scope of what we intend the meaningof the term “seam” or “juncture” to cover. Accordingly, when the varioussupport members and straps of the present invention are discussed asconnected to the backpack at or disposed along the various junctures, itis understood that the point of connection or disposal is in a region ator near the particular juncture or seam; the connection point need notbe exactly on that juncture or seam.

[0033] With this in mind, junctures or seams can comprise a generaltransition region in backpack body from one section to another withoutany discontinuity in the panel or side. For instance, first juncture 212between the top side 202 and the body side 210 can generally define aregion where, when body 200 is loaded with contents, the panels or sidestransition from one orientation to another; in other words, the firstjuncture 212 is merely a bend in the backpack body 200.

[0034] Alternatively, continuing to use the first juncture 212 example,seam 212 can be permanent, such as a line of sewing or other type ofpermanent bonding or fusing of the two sides, or it can be a temporaryseam along or near which a body compartment can be opened and closed. Inthe latter case, first juncture or seam 212 can represent an area near aNylon or metal zipper, a hook and loop-type fastener, snaps, buttons,and the like. These options described above for juncture 212 applies, ofcourse, to all the junctures herein described.

[0035] The discussion and designation of the various components of body200 shown in FIG. 2, including the panels or sides and theircorresponding seams as described below, are simplified so that theadvantages of the present invention can be particularly described. Forinstance, it is within the scope of the invention that although body 200defines a compartment into which cargo such as books, clothing, food,etc. may be placed, additional compartments and features such as outerand side compartments, loops, daisy chains, etc. may be added to thebackpack body 200.

[0036] The panels making up backpack body 200, as well as the straps andother components of the invention can variously comprise a number ofnatural or synthetic materials. Natural fabric such as leather, cotton(especially canvas or single-filled duck) and the like may be useful forcertain applications. Preferred are synthetic fabrics made fromthermoplastic materials such as polypropylene, polyvinyl, polyamide(such as Nylon), polyethylene, polyester, etc. We have found 0.005inch-thick polypropylene fabric to be useful. Especially preferred isNylon, which can be textured for breathability, wear-resistance, andwaterproofed with materials such as silicone elastomers and the like.Particularly useful is a type of Nylon known as CORDURA (E.I. du Pont deNemours & Co., Wilmington, Del.). Multiple or composite layerconfigurations as are well-known in the art, in which a tougher, moredurable weave comprises an outer layer while a lighter, thinner, andmore flexible inner weave comprises an inner layer. Some of thesematerials known in the industry, such as GORE-TEX (W.L. Gore &Associates, Newark, D.E.), TRI-SHIELD (Tri-Seal International, Blauvelt,N.Y.), SPANDURA (H. Warsaw & Sons, New York, N.Y.), etc. can be used asappropriate.

[0037] We have found that when using the above materials in fibrousform, finenesses in the range from 75 denier to 2000 denier arepossible. Preferred are fibers in the range of 500 denier to 1050denier; especially preferred is 1000 denier. Various thicknesses offabric can be used as appropriate. In addition, for the differentsupport members or straps variously described herein, widths of anywherefrom 0.25 inch to over 3 inches or more are contemplated; preferred are0.5 inch to 1.0 inch widths.

[0038] A pair of shoulder support members, or straps 300, are shown inFIGS. 2-9. Each strap 300 has a proximal end 310 and a distal end 320.Support member proximal end 310 is connected to pack 200 at firstjuncture 212 via optional yoke 340. Alternatively, proximal end 310 candirectly connect to pack 200 at first juncture 212 without the presenceof yoke 340. In either configuration, each proximal end 310 of shouldersupport member 300 is attached to first seam 212 by stitching, etc. asis well-known in the art. Shoulder support member 300 can becomplemented with padding and adjustment straps (as more clearly shownin FIG. 6), sternum straps connecting each shoulder strap 300 (notshown), etc., as necessary to ensure proper comfort and functionality ofthe overall design.

[0039] Turning now to lateral or side panels 206, a side support memberor strap 400 is shown in FIGS. 3-9 as disposed adjacent each side panel206.

[0040] Each side support member 400 has a proximal end 410 and a distalend 420. As best shown in FIG. 3, the side member proximal end 410 isaffixed to body 200 at the second juncture or seam 214 appropriate forthe side of the bookpack body 200 on which side strap 400 is disposed.Although we prefer that side strap 400 attach to body 200 close to thebottom of the body as shown in the figures, side support member 400 canbe attached to body 200 up to several inches or more above the bottom ofbody 200 along the length of second seam or juncture 214.

[0041] Side support member 400 is preferably disposed along lateral orside panels 206. As will be discussed later, such a configuration allowsthe side strap 400 to redistribute the load borne by the wearer of thebackpack more evenly across the wearer's back and along the shoulderstraps 300.

[0042] Side support member distal end 420 is shown in FIG. 3 asconnected to the distal end 320 of shoulder support member 300,permanently (e.g., by stitching as shown in FIG. 3) or releasably (suchas by a hook and loop type fastener, an adjustable buckle, or the like).The shoulder strap 300 and side strap 400 distal ends cam be connectedso to form the appearance of a continuous strap.

[0043] Side support member 400 can be optionally threaded through aD-ring 360 as shown in FIG. 3. By slidingly engaging strap 400, D-ring360 helps to keep side strap 400 close to side panel 206, aligns thestrap 400 for connection to the shoulder strap 300, and provides stressrelief by allowing side strap 400 to move in response to shifting loads.

[0044] An optional adjustable Nylon or metal buckle 422 or the like isshown in FIG. 3 intermediately disposed between side strap 400 proximaland distal ends. Technically, such a buckle or device may require sidestrap 400 to actually comprise two strap sections; it is understood thatwhen discussing the proximal and distal end of side strap 400 (or anystrap herein), any multiple strap pieces are considered together withany buckle or the like to form a unitary component having a singleproximal end and a single distal end.

[0045] By allowing the effective length of side strap 400 to belengthened or shortened, buckle 422 serves not only to directly adjustthe load distribution borne by the wearer by pulling in or letting outthe shoulder strap 300 via its distal end 320, but it also allows theside straps 400 to act as compression straps, adjusting the shape of thebookpack body 200 via compression or expansion of lateral or side panels206.

[0046] As long as the proximal end 410 of side strap 400 is connected tothe body of bag 200 in the vicinity of second juncture 214, or even somedistance as far as two to three inches or more in any direction awayfrom such seam 214, various adjustment and fastening configurations anddesigns, such as described above and as are well known in the art, arewithin the scope of the invention.

[0047] Another feature of the present invention that provides addedsupport and ergonomic utility to the backpack is a rigid pack bodybottom side 204. As will be seen, such a characteristic serves to keepthe bookpack body 200 square, lifting and compressing the load towardsthe wearer's body and shoulders.

[0048] Although there are a variety of ways in which the bottom of packbody 200 can be made rigid, two are particularly attractive.

[0049] The first involves utilizing a stiffer material for bottom panel204 than the material used for the rest of the backpack body 200. Byusing the term stiffness with respect to bottom side 204, we mean,singly or in combination, the elastic modulus in the three principaldirections (tension, bending, and shear) as well as the overall rigidityof the bottom side 204 when considered by a layperson.

[0050] For instance, bottom panel 204 can comprise a thicker layer ofNylon, polyurethane, polyallomer, etc., increasing the bottom side'sstiffness relative to the other five panels of body 200. This can alsobe accomplished by fabricating the bottom panel 204 as a composite, suchthat various layers of material having dissimilar mechanical propertiesmake up bottom panel 204, or by inserting a rigid member (such as a hardNylon sheet) inside a pocket formed by bottom panel 204, etc.

[0051] For instance, a relatively thick layer of polyurethane orabrasion-resistant Nylon, ranging in thickness from a few millimeters toseveral centimeters or more, can be bonded or otherwise affixed to theoutside of bottom panel 204. This serves not only to increase therigidity of the bottom panel 204, but also serves to protect the bottompanel 204 from wear and abrasion as the backpack is most typicallyplaced on the ground, etc. on the bottom panel 204. Such a layer can begrooved or otherwise molded or shaped, etc. to facilitate non-skiddingand to allow the backpack to be self-standing.

[0052] Another method for increasing the stiffness of the bottom panel240, useable singly or in combination with any of the features describedabove, is by adding one or more bottom straps or members 500. FIGS. 3-4,4A, and 6-9 show a configuration in which two such bottom straps 500 areused.

[0053] Here, a proximal end or region 510 of each bottom strap 500 isconnected to the body 200 on or near a third juncture or seam 216defined at the intersection of outer side 208 and bottom side 204. Eachbottom member 500 preferably is disposed adjacent bottom panel 204 andconnects at its distal end 520 to the right or left shoulder strapdistal end 320 or side strap distal end 420, or both, in the generalvicinity of their intersection as shown in FIG. 3. Again, suchconnection points for both the proximal and distal ends of these bottommembers 500 can be widely varied to serve the purposes which suit theparticular design, and the invention is not so limited to the preciseconnection locations shown in the figures.

[0054] When a single bottom strap is used, one variation shown in FIG.3A is suitable. Here, instead of having a single distal end as describedabove, strap 530 forms a “Y” by dividing into two distal ends 540 and550, each of which connects to the distal end of right and left shouldersupport members 300. Proximal end 560 of such a strap ideally will affixto body 200 at or near the fourth seam 218, approximately equidistantfrom each lateral panel 206. This helps to equally distribute the loadscarried by each distal end 540 and 550 through the shoulder straps 300and ensure that the shape of the bottom side 204 is as flat andsymmetric as possible. Such a design has the added advantage of beingaesthetically pleasing.

[0055] If more than two bottom straps are used, we prefer that they bein multiples of two, although this is not necessary (an odd number ofbottom straps can be used as well). An even number, such as four, allowsfor their symmetric disposal about the bottom panel 204 andcorrespondingly symmetric load distribution.

[0056] One or more optional bottom support members 570 can be used tomaintain the alignment of the bottom straps 500 adjacent bottom panel204. Such a bottom support member can be removably or (preferably)permanently affixed to bottom panel 204 such as by sewing or the like.

[0057] A variation of these support members is shown in FIGS. 4 and 4A.Here, four bottom support members 570, each comprising a length of Nylonstrapping or other material, are affixed at their ends, such as bystitching or the like, to bottom panel 204 so that they generally arealigned with third seam 216. In this configuration, a gap is formedbetween each bottom support member 570 and the bottom panel 204. Eachbottom strap 500 is threaded through this gap, as shown in FIG. 4A, andis thus kept within the confines of the support members 570. Note thatthe ends of each support member 570 shown in FIG. 4A can be movedtogether so that they overlap when affixed to bottom side 204. Thisforms a type of loop through which bottom strap 500 can be threaded.

[0058] In an alternative design (not shown), one end of bottom supportmember 570 can be sewn into bottom panel 204 and a ring or loop ofmaterial such as metal, Nylon, polyester thread, etc. can be formed inor attached to the other end of member 570. Bottom strap 500 can then bethreaded through this ring or loop.

[0059] In addition to being a length of Nylon or other webbing orstrapping material, bottom support member 570 can simply comprisemultiple or solitary D-rings, clips, two-piece configurations withstraps having adjustable buckles or clasps, etc. Such alternativeconfigurations can be tailored to facilitate adjustability, flexibility,and strain relief as dictated by the design of the backpack and itsparticular performance requirements.

[0060] As shown in FIGS. 4 and 4A, we prefer that at least two bottomsupport members 570 be used for each bottom strap 500. However, less ormore may be used depending upon the load designation, the number ofbottom straps, aesthetic considerations, etc.

[0061] An additional optional feature of the invention is one or moretop straps or members 600. FIGS. 3 and 7-9 show a configuration in whichtwo such top straps are used.

[0062] Here, a proximal end or region 610 of each top strap 600 connectsto the backpack body on or near a fourth juncture or seam 218 defined atthe intersection of the outer side 208 and top side 204. Each top member600 runs along the top panel and connects at its distal end 620 to theright or left shoulder support member 300 at a point distal to whereshoulder strap 300 attaches to backpack body 200. For instance, in FIG.3, top strap 600 attaches to shoulder strap 300 several inches from body200. Top strap 600 may also attach to optional yoke 340. Generally,however, we prefer that the distal end 620 of top strap 600 attach tothe shoulder support member 300 at a point approximating the uppermostportion of the wearer's shoulder when the backpack is fitted on awearer. As will be described in detail below, this attachment pointprovides the most efficient and direct load transfer and helps tomaintain an ideal square shape to the top of bookpack body 200.

[0063] Again, such connection points for both the proximal and distalends of these top members 600 can be widely varied to serve the purposeswhich suit the particular design, and the invention is not so limited tothe precise connection locations shown in the figures.

[0064] As discussed with respect to the bottom straps, a variety ofconfigurations and numbers of top straps can be used in the presentinvention. For instance, a top strap having a “Y” configuration can beused, where each of two distal ends connects to each of the shoulderstraps 300. In the case where more than one or two top straps is used,we prefer that the number of straps be even so to facilitate balancedload transfer and symmetry.

[0065] To assist in maintaining the square shape of the top of thebookpack body 200 and to keep the body 200 in towards the wearer'sshoulders and relatively high, one or more optional minor straps or topsupport members 640 can be used in conjunction with top straps 600.

[0066] Such support members can have the variety of configurations andforms as described above with respect to bottom support members 840.Note a desirable configuration shown in FIGS. 3 and 7-8. In thisembodiment, top support members 640 each has a proximal end 650connected to top side 202 and a distal end 660 which is slidingly orpermanently connected to the top strap 600 via an attached D-ring orsimilar loop.

[0067] Alternatively, a loop for the top strap 600 can be formed fromthe top support member material at its distal end 660, for instance bysewing the distal end over and onto itself. Of course, for thisvariation, the top support member 640 will be affixed to top side 202 sothat the loop is oriented for receiving top strap 600; i.e., generallyperpendicular to the arrangement of FIG. 3.

[0068] These and other top support member 640 arrangements, all of whichare within the scope of the invention, help support the load borne bythe wearer and assist the top straps in keeping the body 200 square atthe top and keeping the bookpack high relative to the wearer'sshoulders. Due to the downward force acting on the top support members640, these members are placed under stress as they assist in bearing theload of body 200 at their distal end 648 where they engage top straps600. It is therefore important that the point of connection between thedistal end 660 of top support member 640 and top strap 600 be designedfor durability and load-bearing functionality. This can be accomplishedby reinforcing the top support member distal end 640 (by, e.g. affixingadditional material), etc. In addition, a low-frictionabrasion-resistant coating can be placed on either or both the distalend 640 and top strap 600 where they directly interface to preventbinding and to protect the materials from abrasion damage.

[0069]FIG. 6A shows an embodiment where bookpack body 200 has anoptional lumbar support member 700, which can take the form of paddingor cushioning, such as polyurethane foam and the like (other features ofthe invention have been removed in FIG. 6A for clarity). Any type ofpadding or other support as is well-known in the art is appropriate.

[0070] For instance, lumbar support member 700 can be permanently (suchas by sewing) or removably (such as by snaps, zipper, hook and loopfasteners, etc.) affixed to the body panel 210 so that it is disposeddirectly adjacent the wearer's lumbar region when worn.

[0071] In an alternative arrangement, a compartment or pouch affixed toor integrally formed as part of the panel forming the body side 210. Alumbar support member is formed when a pad or cargo serving as paddingmaterial (such as a towel) is inserted into this compartment prior towearing the backpack. In this manner, the lumbar support member is anoptional feature that can be selectively created and tailored by thewearer. When such a pad is no longer needed, the contents of the sleevecan be removed and the body 200 of the bookpack operates as if no lumbarpad existed.

[0072] Although it is not shown in the figures, this invention may alsoinclude a waist or hip belt attached to lumbar pad 700, backpack body200, or even side straps 400 or bottom straps 500, singly or incombination as needed. Such a waist belt provides added support andhelps transfer the load caused by the contents to the pelvic region ofthe wearer. Especially useful is a configuration where the waist belt isconnected at its distal and proximal ends to the lower end of bookpackbody 200 in the vicinity of the intersection of side panel 204 and bodypanel 206. It is also useful for the hip belt to be comprised of twopieces, one end of each connected to the bookpack body 200 as described,and the other ends of each strap connectable to one another by aconventional plastic or metal clasp or buckle, hook and loop-typefasteners, etc. as are well-known in the art. This hip belt can beadjustable for a proper fit.

[0073] There may be instances where it is desirable to be able to viewthe contents of the bookpack body 200 without having to opencompartments and inspect the body interior. For instance, it may be thatthe owner of the bookpack is a child student and the parent wishes to beable to see what the child is carrying to school. Concerns aboutsecurity by school, airport, or stadium officials may be satisfied withsuch a bookpack as its contents are readily inspectable. In some cases,such as schools, such a feature may be mandatory given heightenedsecurity measures in the wake of the well-publicized and tragicinstances of school violence.

[0074]FIG. 8 depicts an embodiment of the invention containing this“seethrough” feature. Here, the top, bottom, lateral, outer, and bodyside panels as shown in the previous figures have been replaced withstrapping 800 to form the body 200 of the backpack. Such strapping 800is strong enough and wide enough to provide the carrying capability anddurability required of the bookpack, yet afford enough space betweenstraps so to allow one to readily view (and access) the contents of thebackpack without opening a compartment.

[0075] Note that the outlined margins of the backpack are depicted inFIG. 8 to represent approximate boundaries of the backpack, and not aphysical portion of the body 200 itself. Note also that the variouscomponents of the automatic suspension system, such as shoulder straps300, top straps 600, bottom straps 500, and side straps 400 are stillpresent, thus affording the wearer the same advantages of the ergonomicbackpack but with a see-through body 200.

[0076] As previously discussed, straps 800 comprising the backpack body200 can be made of the same material used for the body panels or theother straps; alternatively, they may be reinforced via high-performancefibers and the like to enhance their load-carrying capacity. Straps 800depicted in FIG. 8 can take on a variety of thicknesses, widths,material forms, attachment methods, patterns (such as the linearcrossing pattern shown in FIG. 8), strap spacing, alignment, etc. Aslong as the straps securely hold and protect the bookpack contents inthe interior compartment while allowing one to view those contents fromthe outside, any strapping configuration is appropriate. One advantageof this configuration is the ability to place and access a relativelysmall bag or piece of luggage; e.g., airline carry-on luggage, insidethe compartment formed by straps 800 such that the luggage handles orstraps may be accessible through a gap or gaps in straps 800. Thisprovides a convenient way for the wearer to carry the luggage on theirback while still being able to conventionally carry the luggage by itsown handle while the luggage is still inside the backpack compartment.

[0077] In addition, straps 800 can be replaced with a webbing or meshmaterial that allows light to penetrate through so that the contents ofthe body 200 are visible to the human eye without undue straining orinspection.

[0078] Instead of replacing the various panels as shown in FIG. 2 withthe strapping 800 as shown in FIG. 8, the panels can also be comprised,partially or completely, of a continuous but transparent or translucentthermoplastic film or layer such as acrylic, cellulose, fluoroplastic,phenoxy, ionomer, rapidly-cooled polyamides such as Nylon 6 and Nylon 6,6, polycarbonate, the polyolefins such as polyethylene, polystyrene, orother material that allows objects or contents of the body 200 to bevisible from the outside.

[0079] Note that to allow the contents of the bookpack body 200 to bevisible to the human eye, it is not necessary that the body side 210 orbottom 204 be transparent. For instance, any portion of the bookpackaligned with the wearer's back, such as body side 210, will by necessitybe blocked by the wearer's body when viewed from the front. Thus, thereis obviously no need for body side 210 to be adapted for see-throughviewing. Likewise, it is typically unlikely that the bottom side 204 ofbody 200 need be transparent.

[0080] On the other hand, and as shown in FIG. 9 for the bottom side204, it is not absolutely necessary that such a transparent embodimentcontain a conventional bottom side 204 or body side 210. This logic canalso be extended such that any combination of transparent or see-throughpanels and conventional opaque panels is within the scope of theinvention.

[0081] It should also be noted that a particular side or panel cancontain both opaque and transparent sections. For instance, if a smallwindow of clear plastic is built into conventional opaque Nylon lateralpanel 206, the purposes of the invention are well-served.

[0082]FIG. 9 shows one configuration of the invention on a wearer. Inuse, a wearer would either load the interior compartment of the bookpack200 with various contents or first strap the backpack on prior toloading.

[0083] In either event, when putting on the bookpack, the wearer willfirst place their left and right arm through gap between the body 200and the appropriate left or right shoulder support members 300,adjusting them to bring the body 200 as close to the wearer's back aspossible without being uncomfortable. If present, adjustable sternumstrap can be connected and adjusted as well.

[0084] Next, side straps, bottom straps, and top straps, if present, areeach adjusted for optimum comfort and functionality using any one ofvarious adjustment devices as are well-known in the art. When thevarious adjustment means have made, the full advantages of the inventionare realized.

[0085] Note that the load borne by the wearer through the shoulderstraps 300, idealized as a distributed load 900 spanning the shoulderand chest area, is more evenly spread throughout the length of straps300 than the conventional backpack of FIG. 1.

[0086] Such an even weight distribution is a direct function of thevarious features and advantages of the present design. Each of thevarious top straps, side straps, and bottom straps act not only to movethe CG 910 up and in towards the wearer's body, but they eachsignificantly redistribute the load borne by the wearer's shoulders viathe shoulder straps 300 along a longer portion of the wearer's body andback as well.

[0087] In particular, and as shown in FIG. 9, side straps 400, connectedthrough their distal ends 420 to the distal ends of shoulder straps 300,act to redirect the load of the bookpack body 200 in the direction ofthe side straps 400. The CG 910 is now located between the wearer's bodyand second seam 214 where the side member proximal end 410 of strap 400attaches to bookpack body 200, redirecting the load in the direction ofthe straps 400. Accordingly, the “hinge point” of conventional bookpacksis effectively removed. This helps to distribute the weight of thebookpack more evenly around the strap and across the back as shown inFIG. 9.

[0088] The rigid bottom, either by way of a bottom side 204 having ahigher stiffness than the other panels, or by way of (or in addition to)a bottom strap or member 500, also adds to the functionality of thepresent invention. As previously discussed, a rigid body bottom helps tomaintain the square shape of the bookpack body 200 by lifting anddirecting the load towards the wearer's body and shoulders. In addition,side straps 400 also serve to increase the overall rigidity of the lowerportion of the backpack body 200, and works quite effectively inconjunction with the rigid bottom to serve this purpose.

[0089] By attaching the distal end 520 of the bottom strap 500 to thedistal end 320 of shoulder strap 300 a portion of the load borne by thewearer through this connection point is distributed to the bottom strap500. This serves to keep the shoulder strap 300 from cinching up underthe wearer's arm, enhancing the wearer's load-carrying capability andoverall comfort.

[0090] It is understood that the above advantages of the rigid bottomcan be realized alone or in enhanced fashion when operating inconjunction with bottom support members 570.

[0091] Finally, top straps or members 600, working alone or inconjunction with top support members 640, act through its point ofattachment at or near the fourth juncture to keep the bookpack body 200square along the top. They also redirect the forces acting on theshoulder straps 300 along the top straps 600, again reducing the loadplaced on the wearer's shoulders.

[0092] These features create an automatic suspension system in which thecenter of gravity of the backpack is moved higher and closer to thewearer's body, and the load borne by the wearer's shoulders isredistributed along a longer portion of the wearer's body and back. Sucha system allows the wearer to realize the advantages of the system bycarrying more weight for longer periods of time with less discomfort,pound-for-pound, experienced with conventional bookpacks.

[0093] This invention has been described and specific examples of theinvention have been portrayed. The use of those specific examples is notintended to limit the invention in any way. Additionally, to the extentthat there are variations of the invention which are within the spiritof the disclosure and yet are equivalent to the inventions found in theclaims, it is our intent that those claims cover those variations aswell.

1. A backpack for a wearer with shoulders and a back comprising: abackpack body having an outer region and a center of gravity, andstrapping adapted to form shoulder support members at least partiallysupporting the backpack body with the wearer's shoulders and to supportthe backpack body from a lower portion of the backpack body and whereinthe shoulder support members shift the center of gravity towards thewearer's back when the backpack is worn by that wearer.
 2. The backpackof claim 1 where the shoulder support members are connected to the lowerportion of the backpack body.
 3. The backpack of claim 1 where thebackpack body includes a top region and a body region and the shouldersupport members have a proximal end each connected to the backpack bodyat a first juncture between the top region and the body region.
 4. Thebackpack of claim 1 wherein the strapping is further adapted tocooperatively support the backpack body at an upper portion of theoutside region.
 5. The backpack of claim 1 wherein the strapping isadjustable in length.
 6. The backpack of claim 1 where the backpack bodyincludes a top region, a body region, and lateral regions and furthercomprising at least one side support member adjacent one of the lateralregions and having a proximal end connected to the backpack body at asecond juncture between the outer region and one of the lateral regionsand a distal end connected to a shoulder support member.
 7. The backpackof claim 1 where the backpack body includes a top region and a bottomregion and additionally comprising a bottom member having (a) a proximalend connected to the backpack body at a third juncture between the outerregion and said bottom region, and (b) two distal ends, each distal endconnected to the strapping.
 8. The backpack of claim 7 additionallycomprising at least one bottom support member having a proximal endconnected to the bottom region and a distal end connected to the bottommember.
 9. The backpack of claim 8 additionally comprising a guideadapted to direct the bottom member along a lateral region.
 10. Thebackpack of claim 9 where the guide adapted to direct the bottom memberalong a lateral region comprises a D ring.
 11. The backpack of claim 1additionally comprising a top member having (a) a proximal end connectedto the backpack body at a fourth juncture between the top region and theouter region, and (b) two distal ends, each distal end connected to oneof each of the shoulder support members.
 12. The backpack of claim 11additionally comprising a guide adapted to direct the top member along alateral region.
 13. The backpack of claim 12 where the guide adapted todirect the top member along a lateral region comprises a D ring.
 14. Thebackpack of claim 11 further comprising a guide adapted to direct thetop member along a lateral region and further comprising at least onetop support member having a proximal end connected to the top region anda distal region connected to the top member.
 15. The backpack of claim 1where the backpack body includes a body region and further comprising alumbar support member disposed adjacent the body region.
 16. Thebackpack of claim 1 further comprising a yoke connected to the backpackbody and positioned along the shoulder support members.